Hi terryR1,
Thanks for your post and apologies to here you're back here again after a few weeks.
If you updated the OS or your browser then you would need to re-register your device. It's easy to do though so don't worry. Using your PC/Laptop go to anywhere.virginmedia.com > My Profile > Device Settings. Remove the previous registration by clicking on the Delete button.
Once you've done this, using the device you are trying to re-register, open up the TV Anywhere app and log in. Try to stream Channel 4 and this should then prompt you to register the device.
Follow the prompts on the screen and this will register the device for you and streaming will then commence 
Let me know how things go.
